Tungsten Lanthanum Oxide Stem (WL-S)

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This special Tungsten Lanthanum Oxide (WL) was specifically developed for use in the stems (support rods) of high-pressure discharge lamps. A special production process is used to create a more fine-grained microstructure than is found in standard quality tungsten-lanthanum oxide. Thanks to this special microstructure, the breaking strength of the material is higher than that of standard quality WL and WVM even following exposure to high thermal loads.

This material data has been provided by Plansee.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts


Chemical properties



1 %

Show Supplier Material materials with Lanthanum of 1 %

as La₂O₃



Technological properties

Application areas

WL-S is therefore the perfect material for support rods which have to maintain the anode and cathode in precisely the same position throughout the entire lifetime of a high-pressure discharge lamp.